sum-of-turtles-with condition [list of commands]
Reports the total value of [list of commands] when run over the
turtles that satisfy the condition . If there are no turtles in
which the condition is true, returns 0. Note: This command can
also be executed by patches, for example within an ask-patches
statement.
Examples:
sum-of-turtles-with [color = red] [age] returns the sum of the ages
of all the red turtles.
Related commands:
sum-of-turtles
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